Well, she's not wrong, but also:

"This might surprise you, but suddenly finding yourself growing parts you didn't have before and being out of control of yourself is spooky," he scowls. "Is this what you really look like, then?"

If there's such a thing as true appearance with the fae, anyway. She seems more solid and definite to his eye than she had outside the fair, and he wonders what the point of hiding who she was was supposed to accomplish.